At the beginning of June, the UK average price of a litre of diesel was 183.75p. However, by the end of the month, it had tumbled by 16.6p to 167.14p. That's the biggest monthly slide since records began.

At the beginning of June, the UK average price of a litre of diesel was 183.75p. However, by the end of the month, it had tumbled by 16.6p to 167.14p. That's the biggest monthly…

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